Phosphogypsum-sludge combined curing treatment method

A technology of curing treatment and phosphogypsum, which is used in filling, solid waste removal, construction, etc., can solve problems such as large addition of curing agent, difficulty in large-scale promotion and application, and increase in project cost.

Inactive Publication Date: 2009-11-18
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the dredged silt is disposed of by throwing mud, which occupies a large amount of land, and due to the poor permeability of the dredged silt, it is difficult to reuse the occupied land in a short period of time, thus increasing the project cost while occupying the land; The heat treatment method is to convert the dredged silt into building materials by heating and sintering. This method has small processing capacity and high cost, and is difficult to be popularized and applied on a large scale; the chemical solidification method is to add cement-based solidi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] The test silt was dredged from Baima Lake District, Huai'an City, and its performance indicators are shown in Table 1. The phosphogypsum was taken from a phosphogypsum yard of a phosphate fertilizer factory in Huai'an, Jiangsu Province, and the moisture content of phosphogypsum was 29%. Since phosphogypsum is piled up in the yard, it is easy to cement and form aggregates under the pressure of its own weight, with a diameter of about 2 to 10 cm.

[0018] Table 1 Physical property index of sludge

[0019] rock and soil

[0020] Manually crush these agglomerates and pass through a 5mm sieve; 3 Silt (1460kg) and 1300kg of phosphogypsum are mechanically stirred and mixed, and the water content of the phosphogypsum-silt mixture is 57%; then add 7.2% (200kg) of quicklime and 4.9% (135kg) of fly ash to the phosphogypsum-silt mixture , mechanically stirred for 4 minutes, and then stacked the stuffed material. After 3 days of stuffed material, the compaction test was c...

example 2

[0022] 1m3 silt (1460kg) and 1000kg of phosphogypsum were mechanically stirred and mixed, and the water content of the phosphogypsum-silt mixture was 60%; then 147.6kg of 6% quicklime and 157.4kg of 6.4% fly ash were added to the phosphogypsum-silt mixture , mechanically stirred for 4 minutes, and then stacked the stuffed material. After 3 days of stuffed material, the compaction test was carried out with a light compaction instrument to obtain the compacted dry density. The φ5×10cm cylindrical sample was made by the static pressure method, and the unconfined resistance of the sample was measured. Compressive strength q u =200.3kPa, the unconfined compressive strength q of the sample when curing for 7 days u =396.8kPa, the unconfined compressive strength q of the sample when curing for 28 days u =986.0kPa, meeting the mechanical performance requirements as a filler.

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Abstract

The invention discloses a phosphogypsum-sludge combined curing treatment method. The method can combine curing treatment for sludge and industrial waste phosphogypsum produced in civil engineering and hydraulic engineering. The method comprises the following implementation steps: a, measuring the water content of the phosphogypsum, water content of the sludge and clay content; b, fragmentizing the phosphogypsum; c, mixing the phosphogypsum and the sludge; d, adding a curing agent into the mixture; and e, shelving the mixture. The phosphogypsum-sludge mixed aggregates after curing treatment can be used as an earthwork stuffing for paving roads, filling dams and the like, and also can be used as solid wastes to be piled or directly embedded so as to save large amount of heap site selection charge and anti-seepage treatment charge; therefore, the method has large economic benefit and environmental benefit.

Description

technical field [0001] The invention relates to a phosphogypsum-silt joint solidification treatment method, which can mix and solidify industrial waste phosphogypsum and sludge generated in civil engineering and water conservancy projects into general solid waste, and the cured product after treatment can be used as engineering waste. Filling can also be directly landfilled. The utility model belongs to the technical field of industrial waste treatment and environmental protection. Background technique [0002] 1. Phosphogypsum [0003] Phosphogypsum is the waste residue discharged from the ammonium phosphate plant and calcium hydrogen phosphate plant in the process of producing phosphate fertilizer and phosphoric acid. The main component of phosphogypsum is calcium sulfate dihydrate (CaSO 4 2H 2 O), its content is about 70%. In addition to calcium sulfate, phosphogypsum also contains undecomposed phosphate rock, unwashed phosphoric acid, calcium fluoride, iron aluminum ...

Claims

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Application Information

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IPC IPC(8): B09B3/00C04B14/02E01C7/00E02D17/18
CPCY02W30/78
Inventor 高玉峰桂跃黎冰陈国栋周源武广繁张健
Owner HOHAI UNIV
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